Say what you will about Giants coach Tom Coughlin, but don’t ever call him unprepared.

For Coughlin, details are as vital as air — and that includes the rare practice of giving his players an advance scouting report not just of their opponent, but the referees that will call the game as well.

Ed Hochuli — one of the NFL’s best known and highly regarded officials — will referee Sunday’s NFC Championship. The assignment was first reported by footballzebras.com and confirmed by The Post.

If Coughin stays true to form, safety Deon Grant said Big Blue will get a report on the veteran official and his crew at some point tomorrow.

“Yeah, they prepare us with that,’’ Grant told The Post. “They don’t tell us that until the day before the game.’’

In addition to Coughlin, the veteran safety has played for five other NFL coaches — George Seifert, John Fox, Jack Del Rio, Mike Holmgren and Jim Mora. Jr.

Only Coughlin, Grant said, provides that information.

“That’s one thing that makes Coughlin so unique,’’ he said, “because I’ve never had that from a head coach before, the way he prepares us for that, just to give us a heads-up for what [the officials] look for more of.’’

For many fans, Hochuli — who also officiated last year’s AFC Championship Game between the Jets and Steelers — is best known as one of the NFL’s top referees.

He’s also the one with the huge arms that earned him the nickname “Hochules” and belie the 61-year-old’s status as a grandfather of 10.

He has been an NFL official since 1990, seven years after the trial lawyer became a founding partner in Jones, Skelton & Hochuli, P.L.C. in Phoenix.

He’s been quoted as saying “A trial is nothing, pressure-wise, compared to the NFL. … I have that long [snaps his fingers] to make a decision with a million people watching and second-guessing [via video] in slow motion.

“ You’ve got to be right or wrong. I love the satisfaction when you are right — and the agony when you are wrong.’’